| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.pig.newplan.logical.expression; |
| |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| import org.apache.pig.newplan.OperatorPlan; |
| import org.apache.pig.newplan.PlanVisitor; |
| import org.apache.pig.newplan.PlanWalker; |
| |
| /** |
| * A visitor for expression plans. |
| */ |
| public abstract class LogicalExpressionVisitor extends PlanVisitor { |
| |
| protected LogicalExpressionVisitor(OperatorPlan p, |
| PlanWalker walker) throws FrontendException { |
| super(p, walker); |
| |
| if (!(plan instanceof LogicalExpressionPlan)) { |
| throw new FrontendException( |
| "LogicalExpressionVisitor expects to visit " + |
| "expression plans.", 2227); |
| } |
| } |
| |
| public void visit(AndExpression op) throws FrontendException { |
| } |
| |
| public void visit(OrExpression op) throws FrontendException { |
| } |
| |
| public void visit(EqualExpression op) throws FrontendException { |
| } |
| |
| public void visit(ProjectExpression op) throws FrontendException { |
| } |
| |
| public void visit(ConstantExpression op) throws FrontendException { |
| } |
| |
| public void visit(CastExpression op) throws FrontendException { |
| } |
| |
| public void visit(GreaterThanExpression op) throws FrontendException { |
| } |
| |
| public void visit(GreaterThanEqualExpression op) throws FrontendException { |
| } |
| |
| public void visit(LessThanExpression op) throws FrontendException { |
| } |
| |
| public void visit(LessThanEqualExpression op) throws FrontendException { |
| } |
| |
| public void visit(NotEqualExpression op) throws FrontendException { |
| } |
| |
| public void visit(NotExpression op ) throws FrontendException { |
| } |
| |
| public void visit(IsNullExpression op) throws FrontendException { |
| } |
| |
| public void visit(NegativeExpression op) throws FrontendException { |
| } |
| |
| public void visit(AddExpression op) throws FrontendException { |
| } |
| |
| public void visit(SubtractExpression op) throws FrontendException { |
| } |
| |
| public void visit(MultiplyExpression op) throws FrontendException { |
| } |
| |
| public void visit(ModExpression op) throws FrontendException { |
| } |
| |
| public void visit(DivideExpression op) throws FrontendException { |
| } |
| |
| public void visit(MapLookupExpression op) throws FrontendException { |
| } |
| |
| public void visit(BinCondExpression op) throws FrontendException { |
| } |
| |
| public void visit(UserFuncExpression op) throws FrontendException { |
| } |
| |
| public void visit(DereferenceExpression op) throws FrontendException { |
| } |
| |
| public void visit(RegexExpression op) throws FrontendException { |
| } |
| |
| public void visit(ScalarExpression op) throws FrontendException { |
| this.visit( (UserFuncExpression)op ); |
| } |
| |
| } |